ICSE Class 10 Physics 2017 Solved Paper

SECTION - II

A uniform half metre rule balances horizontally on a knife edge at $29 {\cm}$ mark when a weight of $20 {\gf}$ is suspended from one end.

Question : 24 of 65

Marks: +1, -0

What is the weight of the half metre rule?

Solution:

Let the weight of half metre rule be '

{\W}

' gf.
According to the principle of moments,
Anticlock wise moments

\;=\;\text " Clockwise moments "\;

\; ∴ \; {\W} × 4\;=20 × 21

⇒\; {\W}\;=\;{20 × 21}/{4}=105 {\gf}

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